Wednesday’s powerful storm knocked down trees and power lines and briefly left almost 9,000 residents and businesses without power on the South Shore and in the Brockton area.

The Blue Hill Observatory in Milton recorded a wiond gust of 63 mph.

As of 8:30 a.m., National Grid reported a total of 20,304 customers without power, with 6,877 of those in the local area. Almost all those customers now have their power back. As of 9 a.m., 805 customers in Norfolk and Plymouth Count ies were still without power, among 3,763 statewide.

As of 9:30, NStar reported 1.288 power failures in Marshfield, 1,261 in Duxbury and 385 in Plymouth, out of a total of 5,210.

Police and fire departments reported power failures in Cohasset, Halifax, Hanoover, Marshfield, Norwell and Pembroke, with the largest number in Hanover.

No weather-related traffic accidents or injuries had been reported.

The National Weather Service said wind gusts as high as 48 miles an hour are expected Wednesday afternoon before the storm begins to taper off. Two or more inches of rain could fall.

The storm arrived on the busiest travel day of the Thanksgiving holiday. No serious highway backups had been reported. At Logan Airport, almost all Cape Air flights had been canceled. Only a handful of major airline flights had been canceled. The Steamship Authority has suspended all ferry service to Martha's Vineyard and Nantucket island due to high winds and rough seas.